"What we think happened was the mom had the babies and she put them in a safe spot â?¦ and she left. Then they got boxed up and they got shipped," Humane Society nurse Jenny Bonomini told the ABC affiliate.

The brother and sister were 2 days old when they arrived April 4. They have been given technologically appropriate names - Mouse for him, Wifi (as in Wi-Fi) for her.

"They're doing well and are growing into very happy and healthy kittens!" Human Society spokeswoman Kelli Schry told USA TODAY.

The pair will stay at the nursery several more weeks, then head to a foster home. At 8 weeks old, they'll be spayed and neutered and put up for adoption.